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Low Voltage Metal Enclosed Drawout Switchgear
MNS-SG Guideform Specification
Specification Number: 2TDC490003 MNS-SG Rev. A
Product Name: Low Voltage Metal-Enclosed Drawout Switchgear
Section 26. 26 00.11
Low Voltage Metal-Enclosed Drawout Switchgear (MNS-SG)
Part 1 GENERAL INFORMATION
1.01
SUMMARY
A This specification defines low voltage metal-enclosed switchgear assemblies utilizing ABB
MNS-SG Low Voltage Metal-Enclosed Draw-out Switchgear Assemblies constructed to ANSI
C37.20.1 standards, CSA C22.2 No. 31, UL 1558.
B Circuit breakers shall be draw-out type ABB Emax circuit breakers with ABB electronic trip
units. Circuit breakers shall have interrupting ratings and withstand capabilities to meet
system application. Circuit breakers shall be available in 800, 1200, 1600, 2000, 2500, 3200,
4000 and 5000 A frame sizes.
1.02
STANDARDS
A Switchgear shall be designed, manufactured and tested in accordance with the following:
1. ANSI C37.20.1 – Metal-Enclosed Low Voltage Power Circuit Breaker Switchgear
2. ANSI C37.50 — Test Procedure for Low Voltage AC Power Circuit Breakers Used in
Enclosures
3. ANSI C37.51 – Conformance Testing of Metal-Enclosed Low Voltage AC Power Circuit
Breaker Switchgear Assemblies
4. UL 1558 – Metal-Enclosed Low Voltage Power Circuit Breaker Switchgear
5. CSA C22.2 No. 31
B Main and Feeder Circuit Breakers used in MaxSG shall be designed, manufactured and tested
in accordance with the following:
1. ANSI C37.13 — Low Voltage AC Power Circuit Breakers Used in Enclosures
2. ANSI C37.16 — Preferred Ratings, Related Requirements, and Application for Low
Voltage Power Circuit Breakers and AC Power Circuit Protectors
3. ANSI C37.17 — Trip Devices for AC and General Purpose DC Low-Voltage Power Circuit
Breakers
4. UL1066 – Low Voltage AC and DC Power Circuit Breakers Used in Enclosures
1.03
SUBMITTALS – FOR REVIEW AND APPROVAL
A The following information shall be submitted to the Engineer for review and approval:
1. Table of contents
2. Electrical bill of material
3. General arrangement drawings
4. Single line diagram
5. Nameplate information
6. Schematic diagrams and breaker control schematic diagrams.
2TDC490003 MNS-SG
Low Voltage Metal Enclosed Drawout Switchgear
©Copyright 2012 ABB Inc. All rights reserved
Section 26. 26 00.11
Low Voltage Metal-Enclosed Drawout Switchgear (MNS-SG)
1.04
SUBMITTALS – FOR CONSTRUCTION
A The following information shall be submitted for record purposes:
1. Final As-built drawings and information as described and listed in Section 1.03
incorporating
2. Complete point-to-point wiring drawings.
3. Certified Test Reports
4. Installation Information
1.05
QUALIFICATIONS
A The manufacturer of the assembly shall be the manufacturer of the major components within
the assembly.
B The manufacturer of this equipment shall be ISO 9001 or 9002 certified.
C The manufacturer shall provide Seismic certified equipment that complies with the following
standards: IBC-2009, ASCE7-10
1.06
DELIVERY, STORAGE, AND HANDLING
A Equipment shall be properly packed for delivery, handled at site, and stored in accordance
with the manufacturer’s instructions. A set of these instructions will be included with the
equipment at time of shipment.
1.07
OPERATION AND MAINTENANCE MANUAL
A Equipment operation and maintenance manuals shall be provided with each switchgear line
up and shall include the following:
1. UL Authorization Page
2. General Information (Recommendations, Manual, and LV Switchgear Features)
3. Project Specs
4. As-Builts Drawings (electrical bill of material, general arrangement drawings, single line
diagram, nameplate schematic diagrams, breaker control schematic diagrams, and
interconnections and wiring diagrams)
5. Electrical Bill of Material
6. Test Reports
7. Measurement Equipment Calibrations
8. Low Voltage Switchgear Install and Maintenance Manual
9. Cut Sheets and Catalogs from each of the components used in the switchgear project
Part 2 PRODUCTS
2.01
MANUFACTURER
A Metal-Enclosed free-standing enclosure containing Low Voltage Power Circuit Breaker shall
be ABB MNS-SG using Emax type Low Voltage Power Circuit Breakers.
2TDC490003 MNS-SG
Low Voltage Metal Enclosed Drawout Switchgear
©Copyright 2012 ABB Inc. All rights reserved
Section 26. 26 00.11
Low Voltage Metal-Enclosed Drawout Switchgear (MNS-SG)
2.02
RATINGS
A The System shall be rated for a maximum voltage rating of 600 Vac.
B The bus system ampacity of the Low Voltage Switchgear shall have the following ratings:
1. 1600A
2. 2000A
3. 3200A
4. 4000A
5. 5000A
C The system shall be designed for use on 50/60 Hz electrical systems up to 600 Vac.
D The systems shall be able to be used in 3-Phase 3-Wire systems or 3-Phase 4-Wire electrical
systems.
E The switchgear assembly shall be rated to withstand mechanical forces to extend during
short-circuit conditions when connected to a direct power source having an available fault up
to 100kA at 480V and 85kA at 600V.
F
The short circuit current rating of the system shall be determined by the available fault current
at the Low Voltage Switchgear. All interrupting ratings shall be accomplished without the use
of limiter fuses.
G The switchgear bus brace rating shall be 65ka or 100kA.
H All circuit breakers shall have a minimum short circuit interrupting capacity of:
1. [42 kA, 65 kA, 85 kA, and 100 kA]
2.03
STRUCTURE
A General
1. The switchgear assembly shall consist of one or more enclosed vertical sections in an
[indoor NEMA 1, Indoor NEMA 1 with gasketed] front doors enclosure. The ends shall be
designed to allow installation of future sections. Each vertical section shall contain up to
four high individually enclosed Emax power breakers with uniformed height or instrument
compartment and a full-height rear compartment housing the buses and outgoing cable
connections.
2. The basic structure shall provide a rigid platform based on a C-channel design. The
structure shall be comprised of 12 and 14 gauge galvanized steel.
3. Four lifting eyes shall be provided on the roof of every shipping split.
4. The structure shall be listed and labeled under UL 1558.
5. The sides shall be covered with removable screwed on covers. The top shall be provided
with flat roof which has outlets to insure adequate air flow within the enclosure. The rear
covers shall be fabricated of a (3) pieces and provided with lifting handles for ease of
handling and installation. All covers shall be at a minimum 14 gauge steel.
2TDC490003 MNS-SG
Low Voltage Metal Enclosed Drawout Switchgear
©Copyright 2012 ABB Inc. All rights reserved
Section 26. 26 00.11
Low Voltage Metal-Enclosed Drawout Switchgear (MNS-SG)
6. Finish: Steel parts shall be prepared for painting by a four-stage wash system consisting
of degreasing, fresh water rinse, zinc phosphate immersion, and fresh water rinse.
Following the wash system, all steel parts shall be finished with a duplex finish system
consisting of powder coat paint over hot dipped galvanized steel. The steel parts are
coated with a minimum 2 mils dry film thickness of TGIC free polyester powder with
electrostatic equipment. The finish of external steel parts shall be hammer tone texture.
Internal painted metal parts shall have no texture. The steel parts shall be cured and
baked properly. Paint finish color shall be ANSI # 61 light gray. Painted metal parts shall
maintain the following minimum mechanical criteria:
Adhesion
Hardness
ASTM D3359
ASTM D3363
Abrasion
Impact
Flexibility
Color
Corrosion
Humidity
ASTM 4060-84
ASTM D2794
ASTM D552
ASTM E308-05
ASTM B-117
ASTM D-2247
Solvent Resistance
ASTM D5402-93
100% (5B)
H-3H
Minimum 3000 cycles to reach
substrate
140-160 lb-in
1/8"
DE <0.5
1500hrs, <1/8"
1500hrs, no blistering
No loss of adheasion and
bleaching
B Dimensions
1. Sections should be a minimum of 23.6” (600mm), 27.6” (700mm), 31.5” (800mm), or 39.4”
(1000mm) wide, respectively, dependent on the circuit breaker frame size being installed.
2. Total switchgear depth is 72.9” (1852mm) with an optional 80.8” (2052mm).
3. Total switchgear height is:
Top of chimney shall not exceed 96.06” (2440mm). Arc-resistant (top of chimney)
96.1" (2439.7mm)
Arc-resistant with overhead lifting device 99.4" (2524mm)
Arc-resistant (top of plenum) 122.1" (3100.5mm)
Non arc-resistant (top of chimney) 95.92" (2436.4mm)
4. Adequate cable space shall be provided to allow all conductors to exit the structure in the
same direction.
5. Note: When addition option base channels add 1.5” to overall structure height.
C Handling
1. The line up shall be divided into shipping splits. The maximum shipping length shall not
exceed 71” (1800 mm). Any lineup that is in excess of 71” (1800 mm) shall be divided into
shipping splits accordingly.
2. Switchgear shall be provided with adequate lifting eyes.
2TDC490003 MNS-SG
Low Voltage Metal Enclosed Drawout Switchgear
©Copyright 2012 ABB Inc. All rights reserved
Section 26. 26 00.11
Low Voltage Metal-Enclosed Drawout Switchgear (MNS-SG)
3. A removable shipping base (pallet) shall be provided with every shipping split.
4. Switchgear shall be capable of being rolled or moved into the installation location.
5. Switchgear shall have the capability to be bolted directly to the floor.
2.04
CIRCUIT BREAKER COMPARTMENT
A Circuit Breakers
1. Each circuit breaker shall be mounted in its own individual-barriered, grounded
compartment.
2. Each compartment shall be complete with stationary circuit breaker contacts, mechanical
interlocks, operating devices, and draw-out rails.
3. The circuit breaker draw-out system shall be such that it ensures accurate self-alignment
of the circuit breaker primary and secondary disconnecting means.
4. Positive mechanical interlocks shall prevent racking the circuit breaker in or out unless the
circuit breaker is in the open position.
5. Interlocks shall prevent the circuit breaker from being closed unless it is in the
“connected” or “test” position.
6. The draw-out mechanism shall provide at least four distinct positions “connected”, “test”,
“disconnected”, and “withdrawn”.
7. Complete operation of the circuit breaker and trip unit must be accessible without opening
the circuit breaker door.
8. Padlocking provisions shall permit locking the circuit breaker in either the “test” or
“disconnected” position.
9. Safety shutters shall be provided to cover the circuit breaker primary line and load
disconnects.
10. Each circuit breaker compartment shall contain a rejection feature that allows only the
insertion of an intended circuit breaker.
11. All circuit breakers of like size and ratings shall be completely interchangeable.
12. Future circuit breaker cubicles shall be totally complete including racking mechanisms,
bussing and necessary secondary contacts so that insertion of a circuit breaker of correct
frame size can be done without modification.
B Secondary Connections
1. All customer secondary control and communication connections shall be made from the
front of the switchgear lineup.
2. Dedicated wiring areas shall allow easy access to all control or communication
terminations.
3. All control wire wiring shall be type #14 gauge SIS wire. Current transformer wire shall be
type #10 gauge SIS wire. All wire shall be secured to terminal blocks by ring-tongue type
connectors. Control wiring for breakers shall be at a minimum type #22 gauge SIS wire.
4. Terminal blocks for interconnection shall allow ring-tongue type connectors.
5. Control wiring shall be capable of entering from the top or bottom of each section.
2TDC490003 MNS-SG
Low Voltage Metal Enclosed Drawout Switchgear
©Copyright 2012 ABB Inc. All rights reserved
Section 26. 26 00.11
Low Voltage Metal-Enclosed Drawout Switchgear (MNS-SG)
6. Interconnection of control wiring across shipping splits shall be done at terminal blocks
located on top of the switchgear within the wire tray.
7. All secondary and communication wire shall be securely fastened to the switchgear
without the use of adhesive backed wire anchors.
C Instrumentation / Devices
1. Barriered instrumentation compartments shall be provided for additional space when
instrumentation such as: Power Transformers (PTs), Control Power Transformers (CPTs),
Current Transformers (CTs), (Relays) metering, and etc. are required.
2. The switchgear shall include all protective devices and switchgear listed on drawings
necessary for proper functionality and safe use of switchgear.
2.05
BUSSING AND CABLE COMPARTMENT
A Bussing
1. The horizontal bussing shall be rated to carry the full ampacity of the equipment.
2. The vertical distribution bus shall be rated up to 5000A.
3. All bussing shall be completely isolated from front compartments.
4. The bus material shall be fully plated [silver, tin] copper.
5. All bus joint connections shall be made with a minimum of two grade 5 bolts and secured
by lock washers and washers to withstand mechanical forces exerted during short
circuits.
6. Bus Bracing should be accomplished through polyamide reinforced glass insulators and
be capable of withstanding the mechanical forces exerted during short circuits.” The bus
bracing shall be braced to withstand the Short Circuit rating of the main breaker not to
exceed 100ka.
7. Barriers should be provided to separate the bussing and cable compartments. The
barriers shall be at a minimum 11 gauge galvanized steel and glastic insulating material.
8. The bus arrangements shall be designed to allow for future additions at either end of the
lineup when not used on close coupling connections to transformers.
B Cable Compartment
1. All incoming / outgoing power conductors shall be routed through a rear cable area.
2. Feeder circuit breakers shall have adequate wire bending space regardless of their
ratings and orientations.
3. OPTIONAL – Metal barriers should be provided to separate vertical sections of
switchgear.
2TDC490003 MNS-SG
Low Voltage Metal Enclosed Drawout Switchgear
©Copyright 2012 ABB Inc. All rights reserved
Section 26. 26 00.11
Low Voltage Metal-Enclosed Drawout Switchgear (MNS-SG)
2.06
LOW VOLTAGE POWER CIRCUIT BREAKERS
A Circuit Breakers
1. The circuit breakers shall be individually mounted, draw-out, ABB Emax Low Voltage
Power Circuit Breakers.
2. The circuit breakers shall meet the requirements of ANSI C37.13, 37.16, C37.17, C37.50
and shall be UL 1066 listed and labeled.
3. Circuit breakers shall be available with instantaneous short circuit ratings from 42 kA to
100 kA at 480Vac and 600Vac without the use of current limiting fuses.
4. Circuit breaker accessories shall be the same for all frame sizes
5. Circuit breaker accessories shall be able to be added / replaced in the field with the ability
to maintain the UL listing.
6. All circuit breakers shall be pre-wired for quick and ready installation.
7. The mechanical life for all circuit breakers must be 8000 to 20,000 operations (depending
on the size of the circuit breaker) with a frequency of 30 operations an hour without the
need for maintenance of contacts or arcing chambers.
8. The electrical life for all circuit breakers must be between 3,000 to 10,000 operations
(depending on the size of the circuit breaker) with a frequency of 30 operations an hour
without the need for maintenance of contacts or arcing chambers.
9. The circuit breaker structure shall be made of sheet steel.
10. Padlock devices shall be provided in order to control opening/closing and racking in/out of
the circuit breaker.
11. Optional Kirk Key interlocks to be provided as shown on the customer's single line
diagram.
12. Circuit breaker main contacts should be separate from arcing contacts.
13. All manual control operators for the circuit breaker shall be accessible with the circuit
breaker compartment door stationary and closed.
14. The circuit breakers must indicate the exact position of the main contacts, the circuit
breaker position, and the status of the charging springs on the front of the circuit breaker
with the door closed and stationary.
15. Circuit breakers must be equipped with an interlock to discharge the circuit breaker's
stored energy spring before the circuit breaker can be withdrawn from its cell.
16. The entire line of circuit breakers must be equipped with interchangeable microprocessor
based trip units.
17. Circuit breakers must include a manual spring charging handle that is completely
operable with the circuit breaker compartment door closed. The handle shall be capable
of performing complete charging of the circuit breaker.
2TDC490003 MNS-SG
Low Voltage Metal Enclosed Drawout Switchgear
©Copyright 2012 ABB Inc. All rights reserved
Section 26. 26 00.11
Low Voltage Metal-Enclosed Drawout Switchgear (MNS-SG)
B
Trip Units
1. Circuit breaker trip system shall be ABB series electronic trip units.
2. The trip unit should consist of a solid-state trip actuator and current sensors. Rating plugs
to be sized as needed to meet the drawings without the need to remove and change CTs.
3. The trip units shall incorporate “True RMS sensing”.
4. The trip unit should not require an external power supply for protection. Power should be
supplied through CTs integral to the circuit breaker.
5. The trip unit protective functions shall not rely on or operate from internal batteries.
6. The minimum basic trip unit functions and settings should include:
a. PR121 Series Trip Unit
1). Overload Protection (L): Characteristic t = k/I2 trip threshold settings ranging
from I = (0.4 - 1) X In of the rated value and timing adjustable between
3 – 18 seconds.
2). Short Time protection with adjustable delay (S): Characteristic t = k and
t = k/I2 trip threshold settings ranging from I = (1 - 10) X In of the rated value
and timing adjustable between 0.05 – 0.4 seconds.
3). Instantaneous Short Circuit Protection (I): Trip threshold I = (1, 5,….12) X In
of rated CT value.
4). Ground Fault Protection (G): Characteristic t = k/I2 trip threshold settings
ranging from I = (0.2 - 0.48) X In of the rated value and timing adjustable
between 0.1 – 0.4 seconds.
5). All protective functions except Overload (L) must be capable of being
disabled while maintaining UL approval.
6). Trip unit settings should be accomplished by means of dip switches on the
front of the trip unit.
7). The trip unit should include alarm LED signal for the “L” and “S” function.
b. PR122 Series Trip Unit
1). Overload Protection (L): Characteristic t = k/I2 trip threshold settings ranging
from I = (0.4 - 1)X In of the rated value and timing adjustable between
3 – 144 seconds.
2). Short Time protection with adjustable delay (S): Characteristic t = k and
t = k/I2 trip threshold settings ranging from I = (0.6 - 10) X In of the rated
value and timing adjustable between
.05 – .4 seconds.
3). Instantaneous Short Circuit Protection (I): Trip threshold I = (1, 5,….15) X In
of rated CT value.
4). Ground Fault Protection (G): Characteristic t = k and t = k/I2 trip threshold
settings ranging from I = (0.2 - .1) X In of the rated value and timing
adjustable between 0.1 – 0.4 seconds.
2TDC490003 MNS-SG
Low Voltage Metal Enclosed Drawout Switchgear
©Copyright 2012 ABB Inc. All rights reserved
Section 26. 26 00.11
Low Voltage Metal-Enclosed Drawout Switchgear (MNS-SG)
5). All protective functions except Overload (L) must be capable of being
disabled while maintaining UL approval.
6). The trip unit should include alarm LED signal for the “L” and “S” function.
7). Thermal memory must be present for “L” and “S” functions.
8). Protection against excessive temperature should be available.
9). The trip unit shall provide protection and indication for over temperature.
The option to open the circuit breaker on over temperature shall also be
available.
10). Protection against phase unbalance should be available.
11). The trip unit should be able to provide protection for 50% and 100% rated
neutrals.
12). Zone selectivity function should be present for “S” and “G” functions.
13). Load protection and control should be present. It should be possible to
monitor two loads or allow switching in/out of single loads to ensure minimal
interruption of service.
14). The trip unit shall provide self-diagnosis for real time analysis of the
microprocessor unit.
15). A trip unit test function should be available.
16). The trip unit shall allow programming and control by means of keys and an
LCD.
17). Trip unit access and programming shall be capable of password protection.
18). Auxiliary power available LED shall be provided on the trip unit.
19). A permanent or temporary microprocessor fault LED shall be available on
the trip unit.
20). A "Warning LED" signaling overload current at 0.83 of value, phase
unbalance present, temperature threshold exceeded, contact wear greater
than 80%, and harmonic distortion present shall be provided on the trip unit.
21). An "Emergency LED" signaling overload current greater than 100% of value,
timing in progress for a protective trip, contact wear at 100%, CT
disconnected, and shunt trip disconnected shall be provided on the trip unit.
22). Permanent indicators of L, S, I, G, and T (trip due to overheating) shall be
present. Indicators must remain on for an indefinite time without the
presence of an auxiliary supply or battery voltage present and be activated
in case of reclosing on a fault. A local “RESET” button must be present to
reset indicators.
23). The trip unit must possess the ability to meter and display phase, neutral
and ground current with/without auxiliary power present.
24). The trip unit shall provide contacts for signaling of a protective trip and
microprocessor fault. In addition, a user configurable contact shall be
provided.
2TDC490003 MNS-SG
Low Voltage Metal Enclosed Drawout Switchgear
©Copyright 2012 ABB Inc. All rights reserved
Section 26. 26 00.11
Low Voltage Metal-Enclosed Drawout Switchgear (MNS-SG)
25). The trip unit should be capable of storing circuit breaker-opening data when
an external power supply is available.
26). OPTIONAL – The trip unit shall be capable of supporting Modbus RTU
standard communication protocol by means of EIA RS485-2- Wire Twisted
Pair Bus topology at speeds up to 19,200bps. The communication will
operate via an auxiliary 24V dc voltage supply.
27). OPTIONAL – The trip unit shall provide LED’s for microprocessor fault due
to communication and network activity due to communication.
c. PR123 Series Trip Unit
1). Overload Protection (L): Characteristic t = k/I2 trip threshold settings ranging
from I = (0.4 - 1)X In of the rated value and timing adjustable between
3 – 144 seconds.
2). Short Time protection with adjustable delay (S): Characteristic t = k and
t = k/I2 trip threshold settings ranging from Ic of the rated value and timing
adjustable between 0.05 – 0.4 seconds.
3). Instantaneous Short Circuit Protection (I): Trip threshold I = (1, 5,….15) X In
of rated CT value.
4). Ground Fault Protection (G): Characteristic t = k and t = k/I2 trip threshold
settings ranging from I = (0.2 - .1)X In of the rated value and timing
adjustable between 0.1 – 0.4 seconds.
5). Directional short-circuit protection with adjustable delay (D): Characteristic
t = k; trip threshold I = (0.6 - 10)X In with adjustable timing between 0.20 0.75 seconds.
6). Phase Unbalance Protection (U): Characteristic t = k; trip threshold 0.1 In
<I <0.9 In with adjustable timing between 0.5 - 60 seconds.
7). Under Voltage Protection (UV): Characteristic t = k; trip threshold 0.6 Un
<V <0.95 Un with adjustable timing between 0.1 - 5 seconds.
8). Over Voltage Protection (OV): Characteristic t = k; trip threshold 1.05 Un
<V <1.2 Un with adjustable timing between 0.1-5 seconds.
9). Residual Voltage Protection (RV): Characteristic t = k; trip threshold
0.1 Un <V <0.4 Un with adjustable timing between 0.5-30 seconds.
10). Reverse Power Protection (RP): Characteristic t = k; trip threshold
0.3 Pn <P<-0.1 Pn with adjustable timing between 0.5-25 seconds.
11). All protective functions except Overload (L) must be capable of being
disabled while maintaining UL approval.
12). The trip unit should provide a startup function allowing two sets of thresholds
to be used for “S”, ”I”, ”G”, ”D” protections. The first set of thresholds should
function through a time interval of 100ms - 1.5s adjustable in increments of
0.05s starting form the startup. The second set of thresholds should apply
under normal conditions.
13). Thermal memory must be present for “L” and “S” functions.
2TDC490003 MNS-SG
Low Voltage Metal Enclosed Drawout Switchgear
©Copyright 2012 ABB Inc. All rights reserved
Section 26. 26 00.11
Low Voltage Metal-Enclosed Drawout Switchgear (MNS-SG)
14). Protection against excessive temperature should be available.
15). The trip unit shall provide protection and indication for over temperature.
The option to open the circuit breaker on over temperature shall also be
available.
16). Protection against phase unbalance should be available.
17). The trip unit should be able to provide protection for 50% and 100% rated
neutrals.
18). Zone selectivity function should be present for “S” and “G” functions.
19). Load protection and control should be present. It should be possible to
monitor two loads or allow switching in/out of single loads to ensure minimal
interruption of service.
20). The trip unit shall provide self-diagnosis for real time analysis of the
microprocessor unit.
21). A trip unit test function should be available.
22). The trip unit shall allow programming and control by means of keys and an
LCD.
23). Trip unit access and programming shall be capable of password protection.
24). Auxiliary power available LED shall be provided on the trip unit.
25). A permanent or temporary microprocessor fault LED shall be available on
the trip unit.
26). A Warning LED signaling overload current at 0.83 of value, phase
unbalance present, distorted waveform present, contact wear greater than
80%, warning threshold exceeded, circuit breaker status error, and abnormal
frequency shall be provided on the trip unit.
27). An Emergency LED signaling overload current greater than 100% of value,
timing in progress for a protective trip, contact wear at 100%, CT
disconnected and shunt trip disconnected shall be provided on the trip unit.
28). Permanent indicators of L, S, I, and G (tripped to protective relaying
function) shall be present. Indicators must remain on for an indefinite time
without the presence of an auxiliary supply or battery voltage present and be
activated in case of reclosing on a fault. A local “RESET” button must be
present to reset indicators.
29). The trip unit shall possess the capability to meter and display the following
functions: current (phase, neutral, and ground), voltage, power, power
factor, frequency, peak factor, energy, and historical data.
30). The trip unit must be capable of waveform display and harmonic calculation
up to the 20th harmonic.
31). The trip unit shall provide contacts for signaling of a protective trip and
microprocessor fault. In addition, two user configurable contacts shall be
provided.
2TDC490003 MNS-SG
Low Voltage Metal Enclosed Drawout Switchgear
©Copyright 2012 ABB Inc. All rights reserved
Section 26. 26 00.11
Low Voltage Metal-Enclosed Drawout Switchgear (MNS-SG)
32). The trip unit should be capable of storing circuit breaker-opening data when
an external power supply is available.
33). OPTIONAL – The trip unit shall be capable of supporting Modbus RTU
standard communication protocol by means of EIA RS485-2- Wire Twisted
Pair Bus topology at speeds up to 19,200bps. The communication will
operate via an auxiliary 24V dc voltage supply.
34). OPTIONAL – The trip unit shall provide LED’s for microprocessor fault due
to communication and network activity due to communication.
2.07
NAMEPLATES AND LABELS
A All nameplates shall meet all standards listed in ANSI C37.20.1.
B Precautionary labels meet ANSI Z53.4. Standard nameplates for devices shall be white
background with black lettering phenolic screwed on type with stainless steel screws.
[Optional nameplate colors]
C The main system nameplate shall be stainless steel screwed on type with self tapping screws.
All lettering is engraved. The following information is available on switchgear assembly
nameplates:
1. Manufacturer’s name and address
2. Manufacturer’s type designations
3. Manufacturer’s identification reference
4. Rated maximum voltage (where applicable)
5. Rated power frequency (where applicable)
6. Rated continuous current (main bus)
7. Rated short-circuit withstand current
8. Date of manufacture
9. Instruction manual number
2.08
COMPONENTS
A Instrument Transformers shall comply with IEEE C57.13.
1. Potential Transformers: Insulation Class of 600 volt dielectric, 10 kV full wave BIL.
Accuracy Class is 0.6W and 1.2 X burdens at 60 Hz. Thermal ratings are 150 VA at 30°C
ambient and 100 VA at 55°C ambient and secondary-voltage rating of 120 Vac.
2. Current Transformer: Ratios as indicated; burden and accuracy class suitable for
connected relays, meters, and instruments.
3. Control Power Transformer: Insulation Class is 600 volt dielectric with a secondaryvoltage of 120 Vac. Primary and secondary fuses mounted separately in an instrument
compartment or on onboard fuse clips.
2.09
METERING, INSTRUMENTATION AND COMMUNICATION
A Main Metering and Instrumentation (if desired)
1. Metering shall exceed the capabilities of the circuit breaker trip unit.
2TDC490003 MNS-SG
Low Voltage Metal Enclosed Drawout Switchgear
©Copyright 2012 ABB Inc. All rights reserved
Section 26. 26 00.11
Low Voltage Metal-Enclosed Drawout Switchgear (MNS-SG)
2. Main metering shall be capable of displaying voltage, current, power, energy and THD. It
shall be able to provide a suitable sampling rate and provide RS485 twisted pair
communication port.
B Communication
1. Internal communications within the Low Voltage Switchgear shall be via Modbus.
2. Where stated on data sheets an ethernet gateway or main meter with ethernet
capabilities shall be mounted in the low voltage switchgear.
2.10
ACCESSORIES
A An overhead lift device, track mounted at top of front of switchgear complete with a lifting hoist
and lifting yokes. A portable floor-supported, roller-based, elevating lift truck for moving circuit
breakers in and out of compartments as well as outside the switchgear.
B Portable test unit for testing all functions of circuit breaker, trip units without removal from
switchgear.
C Breaker Test Cabinet: A wall mounted or free standing cabinet used for testing of electrically
operated breakers and other breaker related functions.
Part 3 EXECUTION
3.01
INSTALLATION
A Install and anchor switchgear in accordance with manufacturer’s written guidelines and all
applicable national and local codes.
B All necessary hardware required to secure the electrical equipment in place shall be provided
by Contractor.
3.02
FIELD QUALITY CONTROL
A Adjustments
1. Adjust all operating mechanisms per manufacturer's requirements.
2. Adjust circuit breaker trip and time settings per values required per site engineer.
3. Tighten all bolted bus connections per manufacturer's specifications.
B Cleaning
1. Touch up damaged or scarred surfaces to match original finish.
Contact Us
USA
2TDC490003 MNS-SG
Low Voltage Metal Enclosed Drawout Switchgear
©Copyright 2012 ABB Inc. All rights reserved
Section 26. 26 00.11
Low Voltage Metal-Enclosed Drawout Switchgear (MNS-SG)
ABB Inc.
Low Voltage Products & Systems
3700 W Sam Houston Pkwy S
Houston, TX 77042
Toll Free: 1 888 385-1221
ABB Inc.
Low Voltage Products & Systems
400 Crown Colony Drive, Suite 303
Quincy, MA 02169
www.abb.us/lowvoltage
Canada
ABB Inc.
Low Voltage Products & Systems
2117 - 32e Avenue
Lachine, QC H8T 3J1
Tel.: 1 514 420-3100
Toll Free: 1 800 567-0283
Fax: 1 514 420-3137
[email protected]
ABB Inc.
Low Voltage Products & Systems
201 Westcreek Blvd.
Brampton, ON L6T 5S6
Tel.: 1 905 460-3000
Fax: 1 905 460-3395
ABB Inc.
Low Voltage Products & Systems
110, 4411-6th Avenue S.E.
Calgary, AB T2G 4E8
Tel.: 1 403 278-7111
Fax: 1 403 278-8232
www.abb.ca/lowvoltage
Mexico
ABB Mexico, S.A. de CV.
Low Voltage Systems
Av. Central No. 405, Parque Logístico
C.P. 78395, San Luis Potosí, SLP
Tel.: +52 444 8708 000

2TDC490003 MNS-SG
Low Voltage Metal Enclosed Drawout Switchgear
©Copyright 2012 ABB Inc. All rights reserved